Setting the proxy info in FME Server currently involves using the command line, see https://docs.safe.com/fme/html/FME_Server_Documentation/Content/AdminGuide/Using_FME_Server_with_Proxy_Server.htm
I suggest including these settings in the admin GUI to make them easier to maintain without needing console access to the server.
These settings should override whatever proxy setting is defined in published workspaces (HTTPCaller, etc).
The most important bit is to set the proxy server and enter the authentication details. Defining custom proxy maps is probably less important.


